Polystyrene plastic compositions containing bis-phenoxy compounds as flame retardants

ABSTRACT

1. A PLASTIC COMPOSITION CONTAINING POLYSTRENE HAVING INCORPORATED THEREIN AN EFFECTIVE AMOUNT OF A FLAME RETARDANT WHICH IS A COMPOUND HAVING THE FORMULA   Z(M)-(A1-PHENYLENE)-O-R-O-(A1&#39;&#39;-PHENYLENE)-Z(M)&#39;&#39;   WHEREIN Z IS SELECTED FROM THE GROUP CONSISTING OF BROMINE OR CHLORINE; M AND M&#39;&#39; ARE INTEGERS HAVING A VALUE OF 1-5; I AND I&#39;&#39; ARE INTEGERS HAVING A VALUE OF 0-2; A IS SELECTED FROM THE GROUP CONSISTING OF CYANO, NITRO, LOWER ALKOXY, LOWER ALKYL, FLUORINE DIALKYLAMINO, PHENYL HALO-PHENYL, BENZYL AND HALO-BENZYL; AND R IS SELECTED FROM THE GROUP CONSISTING OF (G) -CH2-(CYCLOHEXYLENE)-CH   (E) PHENYL-CH2-CH2-   (D) -CH2-(X(N)-PHENYLENE)-CH2-

3,849,369 POLYSTYRENE PLASTIC COMPOSITIONS CON- TAINING BlS-PHENOXY COMPOUNDS AS FLAME RETARDANTS Arnold L. Anderson, Alma, Mich., assignor to Michigan Chemical Corporation, St. Louis, Mich.

No Drawing. Continuation-impart of abandoned application Ser. No. 260,240, June 6, 1972. This application Feb. 8, 1973, Ser. No. 330,856 The term of this patent subsequent to May 7, 1991,

has been disclaimed Int. Cl. C08f 45 /60 U.S. Cl. 260-45.9 R 14 Claims ABSTRACT OF THE DISCLOSURE Plastic compositions containing polystyrenes and bisphenoxy compounds having the formula A l Mow- 46 wherein Z is bromine or chlorine, m' and m" are integers having a value of 1-5, i and i are integers having a value of -2, R is herein defined and A is cyano, nitro, lower alkoxy, lower alkyl, fluorine, dialkylamino, phenyl, halophenyl, benzyl or halo-benzyl.

This application is a continuation-in-part of copending application Ser. No. 260,240, filed June 6, 1972, and now abandoned. The entire specification of this case, Ser. No. 260,240, is to be considered as incorporated herein by reference.

The prior art considered in conjunction with the preparation of this application is as follows: U.S. 2,130,990; U.S. 2,186,367; U.S. 2,329,033; U.S. 3,666,692; U.S. 3,686,320; U.S. 3,658,634; German Pat. No. 1,139,636; German Pat. No. 2,054,522; Japanese Pat. No. (72) 14,- 500 as cited in vol. 77, Chemical Abstracts, col. 153737k (1972); Chemical Abstracts, vol. 13, col. 448 Chemical Abstracts, vol. 31, col. 7045 and Journal of the Chemical Society, pp. 2972-2976 (1963). All of these publications are to be considered as incorporated herein by reference.

The present invention relates to plastic compositions containing polystyrenes. More specifically, the present invention covers plastic compositions containing polystyrenes and certain bis-phenoxy compounds (hereinafter defined) as flame retardants for said plastic compositions.

Polystyrenes and utility thereof are known in the art as exemplified by Polystyrene, W. C. Teach and G. C. Kiessling (Reinhold Plastics Application Series), Reinhold Publishing Corporation, New York, 1960 and Moziern Plastic Encyclopedia, 1972-1973, Vol. 49, N0. 10A, October 1972, pp. 97-99, 161 and 271-272 and which publications are in toto incorporated herein by reference.

The need for flame retarding polystyrenes has also been recognized in the art as exemplified by U.S. 3,347,822 and U.S. 3,422,048 and Modern Plastics Encyclopedia, ibid., pp. 221, 222 and 456-458 and which publications are in toto incorporated herein by reference.

The resulant disadvantages in the utilization of various prior art materials as flame retardants for polystyrenes include, without limitation, factors such as thermal migration, heat instability, light instability, non-biodegradable, toxicity, discoloration and the large amounts employed in order to be effective.

Thus, there is always a demand for a material which will function as a flame retardant in polystyrenes and concurrently will not, by incorporation therein, adversely effeet the chemical and/ or physical and/or mechanical nited States Patent C ice properties of the resultant polystyrene plastic composition.

The prior art problem of providing a flame retarded polystyrene composition having desired chemical, physical and mechanical properties has now been substantially solved by the present invention and the above-described disadvantages substantially overcome.

Accordingly, one of the main objects of the present invention is to provide polystyrene plastic compositions which are flame retarded.

Another object of the present invention is to provide a material for polystyrene plastic compositions which will not substantially adversely effect the chemical and/or physical and/or mechanical properties of said compositions.

A further object of the present invention is to provide a flame retardant which is economic and easy to incor porate into polystyrene plastics without being degraded or decomposed as a result of blending or processing operations.

It has been found that the foregoing objects can be obtained by the incorporation of a new class of bis-phenoxy compounds in polystyrene to subsequently provide flame retarded compositions which exhibit outstanding chemical, physical and mechanical properties.

The bis-phenoxy compounds used in the present invention composition have the formula:

where S=saturated ring In Formula I, i+m or i'+m is not greater than 5.

It is to be understood that all of the compounds falling within the above Formula I and as heretofore defined are generically described herein as bis-phenoxy compounds.

The bis-phenoxy compounds are found to be compatible with and effective additives for various polymeric systems to make the resultant polymer flame retardant.

Illustrative (but without limitation) of some of the present invention bis-phenoxy compounds are shown below:

the exemplary definitions of A, Z, R,

listed in Table I.

TABLE I i, i, m and m are Compound No. Z

In general, the

bis-phenoxy compounds are prepared by reacting a halogenated phenol with a halogenated alkane at elevated temperatures in the presence of a basic material such as alkali metal hydroxides, carbonates, bicarbonates, oxides and hydrides. The preferred alkali metals are potassium and sodium. Where one desires to increase, for example, ease of handling the reaction mass, solvents such as ketones (e.g. acetone, methyl ethyl ketone, and methyl iso-butyl ketone), alcohols (e.g. methanol, ethanol, iso-propyl alcohol, butyl alcohol and glycols), or aqueous solvents (e.g. water, a mixture of (II) (III) a ee In the above reaction, X is halogen, preferably chlorine and R is the same as defined herein. Where m and m and i and i are different integers, then equivalent molar portions of the particular halogenated phenol are used with equivalent portions of dissimilar halogenated phenol.

The above reaction is conducted at temperatures ranging from the freezing point of the initial reaction mass to the boiling point thereof. Preferably the temperatures are from about 40 C. to about 200 C. and more preferably from about 50 C. to about 175 C. It is to be understood that the reaction can be conducted under subatomspheric (e.g. *7 atmospheres), atmospheric or super-atmospheric (e.g. l.510 atmospheres) pressure. Preferably, the reaction is carried out at atmospheric pressure.

The above-described processes can be carried out with conventional, readily available chemical processing equipment. For example, a conventional glass-lined vessel provided with heat transfer means, a reflux condenser and a mechanical stirrer can be advantageously utilized in practicing any of the preferred embodiments of the invention described in the examples set forth herein.

The amount of bis-phenoxy compound employed in the present invention compositions is any quantity which will effectively render the polystyrene containing composition flame retardant. In general, the amount used is from about 1% to 25% by weight, based on the total weight of the composition. Preferably, the amount employed is from about 5% to about 20% by weight. It is to be understood that any amount can be used as long as it does not substantially adversely effect the chemical and/or physical and/or mechanical properties of the end polymer composition. The amount utilized, however, is such amount which achieves the objectives described herein.

It is to be understood that the term polystyrene as used herein means polymers containing more than 60% styrene (phenylethylene, vinyl benzene, styrol, cinnamene) C H CH=CH or other unsaturated aromatic monomers comprised of variously substituted styrene derivatives. This term also includes rubber modified impact-resistant polystyrene and styrene-acrylonitrile copolymers (sometimes referred to in the trade as SA or SAN).

Thus the polystyrene used in the present invention compositions is any polystyrene herein defined and which one so desires to flame retard. It is to be understood that the polystyrenes used can be a virgin material, i.e. substantially free of additives such as stabilizers, plasticizers, dyes, pigments, fillers, and the like, or the polystyrenes can have additives (such as those mentioned and described herein) already contained therein or added concurrently with or after the addition of the bis-phenoxy compounds.

Another facet of the present invention relates to the use of certain metal compounds with the bis-phenoxy compounds to promote a cooperative effect therebetween and thus enhance the flame retardancy of the resultant plastic composition as compared to the flame retardancy of either one component used separately. These enhancing agents are from the group antimony, arsenic, bismuth, tin and zinc-containing compounds. Without limitation, examples of said enhancing agents includes Sb O SbCl SbBr SbI3, AS20'3, AS205, ZDBOQ}, 'BaB O -H O,

and stannous oxide hydrate. The preferred enhancing agent is antimony trioxide.

The amount of enhancing agent employed in the present invention compositions is any amount which when used with said bis-phenoxy compounds will promote a cooperative effect therebetween. In general, the amount employed is from about 1% to about 15%, preferably from about 2% to about 10%, by weight, based on the total weight of plastic composition. Higher amounts can be used as long as the desired end result is achieved.

It is also within the scope of the present invention to employ other materials in the present invention compositions where one so desires to achieve a particular end result. Such materials include, without limitation, adhesion promoters; antioxidants; antistatic agents; antimicrobials; colorants; flame retardants such as those listed on pp. 456-458, Modern Plastics Encyclopedia, ibid. (in addition to the new class of flame retardants described herein); heat stabilizers; light stabilizers; pigments; plasticizers; preservatives; ultraviolet stabilizers and fillers.

In this latter category, i.e. fillers, there can be mentioned without limitation, materials such as glass; carbon; cellulosic fillers (wood flour, cork and shell flour); calcium carbonate (chalk, limestone, and precipitated calcium carbonate); metal flakes; metallic oxides (aluminum, beryllium oxide and magnesia); metallic powders (aluminum, bronze, lead, stainless steel and zinc); polymers (comminuted polymers and elastomer-plastic blends); silica products (diatomaceous earth, novaculite, quartz, sand, tripoli, fumed colloidal silica, silica aerogel, wet process silica); silicates (asbestos, kaolinite, mica, nepheline syenite, talc, wollastonite, aluminum silicate and calcium silicate); and inorganic compounds such as barium ferrite, barium sulfate, molybdenum disulfide and silicon carbide.

The above mentioned materials, including fillers, are more fully described in Modern Plastics Encyclopedia, ibid., and which publication is incorporated herein (in toto) by reference.

The amount of the above described materials employed in the present invention compositions can be any quantity which will not substantially adversely effect the desired results derived from the present invention compositions. Thus, the amount used can be zero (0) percent, based on the total weight of the composition, up to that percent at which the composition can still be classified as a plastic. In general, such amount will be from about 0% to about 75% and specifically from about 1% to about 50%.

The bis-phenoxy compounds can be incorporated in to the polystyrenes at any processing stage in order to prepare the present invention compositions. In general, this is undertaken prior to fabrication either by physical blending or during the process of forming polystyrenes per se. Where one so desires, the bis-phenoxy compounds may be micronized into finely divided particles prior to incorporation into the polystyrenes.

EXAMPLE I A polystyrene plastic material (Union Carbide TMDE 6500, a high impact polystyrene product free of additives) is utilized as the base resin in order to prepare 26 formulations (plastic compositions). With the exception of formulation No. 1, the particular bis-phenoxy compound (and the antimony trioxide enhancing agent where indicated) is incorporated into the plastic by adding both to a Brabender mixer (Plastic-Corder, Torque Rheom- 7 eter, Model PLV-lSO, C. W. Brabender Instruments Inc., South Hackensack, N.I.). The mixer is equipped with a pair of roller type blades positioned within a head provided with heat transfer means.

The resultant mixture is heated to about 245 C.; at this temperature, it is in a molten state. The percentages by weight of each component utilized in the respective formulations are listed in Table II. Each formulation is discharged from the mixer and upon cooling solidifies and is ground into chips. The chips are subjected to compression molding in a Wabash press by placing said chips between two platens, the bottom of which contains four equal size depressions three inches by five inches by 4; inch deep. The top platen is then placed over the bottom platen and heat transfer means supplied thereto in order to melt said chips and thus provide solid samples (after cooling) for testing.

Portions of the solid samples of each respective formulation (Nos. 1-26) prepared according to the above described rocedure are then subjected to two different stand ard flammability tests, i.e. UL 94 and ASTM D286370. The UL 94 is, in general, the application of a burner to a test specimen (strip) for a certain period of time and observation of combustion, burning, and extinguishment. This procedure is fully set forth in Underwriters Laboratories bulletin entitled UL 94, Standard for Safety, 1st edition, September 1972 and which is incorporated herein by reference. ASTM No. D-2863-70 is a flammability test which correlates the flammability of a plastic specimen to the available oxygen in its immediate environment; this correlation is stated as an Oxygen Index, O.I., level predicated upon the percent oxygen in the gaseous medium which is required to just provide a steady state of continuous burning of the plastic specimen. This ASTM method is fully described in 1971 Annual Book of ASTM Standards-Part 27, published by the American Society for Testing and Materials, 1916 Race St., Philadelphia, Pa.; this publication is to be considered as incorporated (in toto) herein by reference.

The results of these flammability tests are shown in Table II.

TABLE II [Flammability data for polystyrene plastic compositions containing bis-phenoxy compounds] Enhanc- Bis- Coming agent Oxygen Formulation phenoxy pound, SbzOa, index, number number percent percent percent UL 94 0 18.0 Burns 20 0 21.0 SB 20 31.5 SE-O 0 20.5 SB 20 10 29.0 SE-l 20 0 21.5 SB 20 10 28.5 SE1 20 0 20.5 SB 20 10 27.5 SID-2 20 0 22.0 SB 20 10 30.0 SE-l 20 0 23.0 SB 20 10 31.0 815-! 20 0 22.5 SB 20 10 35.5 SE-O 20 0 22.5 SB 20 10 31.0 SE-l 20 0 22.0 SB 20 10 29.5 SE-1 20 0 20.5 SB 20 10 30.0 813-1 20 0 20.0 SB 20 10 28.5 SE1 20 0 21.5 SB 20 10 31.5 SE-O 20 10 32.0 SIC-0 Referring to Table II, the bis-phenoxy compound number relates to the structural formulae heretofor set forth in Table I; a difference of 2% in the Oxygen Index values is considered significant; and the UL 94 values are on a graduated scale wherein the highest degree to lowest degree of fiame retardancy is respectively SE0, SE-l, SE-2, SB and Burns.

The results shown in Table II demonstrate the unique effectiveness of these bis-phenoxy compounds as flame 8 retardants for polystyrene. Specifically, formulation No. 1 (the control) has a 0.1 of 18.0 and UL 94 value of Burns. In Nos. 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22 and 24, the use of the particular bis-phenoxy compound results in a significant increase (2.05.0%) in fire retardancy as measured by O.I. (While these formulations had a SB rating, UL 94, the individual -U.L. rating has a wide range of values and thus the 0.1. number is, in this case, more indicative of increased flame retardancy.)

The use of an enhancing agent such as Sb O to promote a cooperative effect between such agent and the bis-phenoxy compound is fully demonstrated via the results obtained from testing formulation Nos. 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25 and 26. The highest UL 94 ratings and significantly higher 0.1. values (9.5-17.5% increase) are obtained.

EXAMPLE II Example -I is repeated twice; once using a 10% bisphenoxy compound level and 3% Sb O level and secondly, 15% and 5% levels respectively. At both levels, the O.I. values and UL 94 ratings are slightly lower than the 20% /10% levels of Example I.

EXAMPLE III Portions of the solid samples of Formulation Nos. 1-26 prepared according to the above described procedure of Example I are subjected to the following ASTM tests in order to ascertain other properties of the resultant plastic composition:

(1) Tensile strength (at break): ASTM Test No. D638- (2) Flexural strength: ASTM Test No. D790-63;

(3) Flexural modulus: ASTM Test No. D790-63;

(4) Notched Izod impact: ASTM Test No. D25 6-56; and

(5) Heat distortion temperature (HDT): ASTM Test No.

Each of the aforementioned ASTM tests are standard tests in the art and are utilized collectively in order to ascertain the efficacy of a polymeric system as an overall flame retarded composition for commercial application. All of these ASTM tests are to be considered as incorporated herein by reference.

The results of these ASTM tests show that the physical properties of the present invention compositions are basically the same (except O.I. and UL 94 values) as the plastic material Without the flame retardant (i.e. formulation No. 1). Thus, there is no substantial adverse effect on the physical properties of the plastic material when the novel compounds are incorporated therein.

EXAMPLE IV The procedure of Examples I, II and III are repeated except that the enhancing agent used is zinc borate instead of Sb O Substantially the same results are obtained using zinc borate as those obtained using Sb O The other metal containing compounds are found to be equally effective.

In view of the foregoing examples and remarks, it is seen that the plastic compositions, which incorporate these compounds, possess characteristics which have been unobtainable in the prior art. Thus, the use of these compounds in the above described plastic material as flame retardants therefor is quite unique since it is not possible to predict the effectiveness and functionality of any particular material in any polymer system until it is actively undergone incorporation therein and the resultant plastic composition tested according to various ASTM Standards. Furthermore, it is necessary, in order to have commercial utility, that the resultant flame retarded plastic composition possess characteristics such as being non-toxic. Use of these compounds in the plastic material has accomplished all of these objectives.

enaeie wherein Z is selected from the group consisting of bromine or chlorine; ml and m are integers having a value of l; i and i are integers having a value of 0-2; A is selected from the group consisting of cyano, nitro, lower alkoxy, lower alkyl, fluorine, dialkylamino, phenyl, halo-phenyl, benzyl and halo-benzyl; and R is selected from the group consisting of 10 (g) HZCQ CHQ Where S =saturated rin g 2. The composition as set forth in claim 1 wherein i and i' are both 0.

3. The composition as set forth in claim 1 wherein i and i are both 1.

4. The composition as set forth in claim 1 wherein i and i are both 2.

5. The composition as set forth in claim 3 wherein Z is bromine and A is cyano.

6. The composition as set forth in claim 3 wherein Z is bromine and A is nitro.

7. The composition as set forth in claim 3 wherein Z is bromine and A is lower alkoxy.

8. The composition as set forth in claim 3 wherein Z is bromine and A is lower alkyl.

9. The composition as set forth in claim 3 wherein Z is bromine and A is fluorine.

10. The composition as set forth in claim 3 wherein Z is bromine and A is dialkylamino.

11. The composition as set forth in claim 3 wherein Z is bromine and A is phenyl.

12. The composition as set forth in claim 3 wherein Z is bromine and A is halo-phenyl.

13. The composition as set forth in claim 3 wherein Z is bromine and A is benzyl.

14. The composition as set forth in claim 3 wherein Z is bromine and A is halo-benzyl.

References Cited UNITED STATES PATENTS 3,385,819 5/1968 Gouinlock 26045.75 R

3,560,441 2/1971 Schwarcz et a1. 26045.7 R

3,658,634 4/1972 Yanagi et a1. 161-403 3,717,609 2/ 1973 Kutner 26045.95 G

MAURICE J. WELSH, 111., Primary Examiner U.C. Cl. X.R. 

1. A PLASTIC COMPOSITION CONTAINING POLYSTRENE HAVING INCORPORATED THEREIN AN EFFECTIVE AMOUNT OF A FLAME RETARDANT WHICH IS A COMPOUND HAVING THE FORMULA 